Billy looked at Bart for a moment, his mind trying to think of a proper response. After a few moments of contemplation, he decided on supportive.
"Bart... I know I've only known you like a month or so, but you're my friend... probably one of my closest at this point. Of course you'd be welcome. I mean, yeah, I suppose there's going to be times when I want alone time, or time with Teddy, but that doesn't mean you're not my friend. It's... just different sometimes."
Oh lord, listen to him trying to act like he knew what was going on in life and relationships. But it was true. Him wanting to spend more time with Teddy didn't diminish how he thought of Bart. He wasn't trying to replace him.